Stoker



July '19 1927 E. LUNDGREN STOKER Filed Aug. 30, 1923 w D e l i AL m H m, @W .wm

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Patented July 19, i927.

UNITED s'rA'rEs PATENT oFFicE.

EDWIN LUNDGDEN, or FREDERICK, `MARYLAND, AssIGNoa '.rocoMBUs'rIoN ENGI- NEERING conPonA'rIoN, oF NEW YORK, N. Y., A ooRroRA'rioN or NEW Yonx.

STOKER.

Application met August so, 1923. serial Nu. 660,095.

`My invention relates td furnaces and .has special reference to furnaces of the multiple retort underfeed stoker type.

An' object of the invention is to rovide a novel and improved stoker of. this type.

` Another object of the inventionus to provide novel andimproved fuel feeding means that is particularl applicable to stokers having 'a relatively ong underfeed section to meet the demand of relatively high fuel burning rates per retort:

Another object of the invention is to provide novel and improved air supplying and fuel supporting means for a furnace ofthe type above indicated. K

The several features of the invention, whereb the above mentioned and .other o bjects o the invention may be attained, will be clearly understood from the following description and accompanying drawings, in which,-

Figure 1 is a longitudinal sectional view, partly in elevation,v of a multiple .retort stoker embodying the features of the invention in their preferred form;

Fig. 2 is a detail sectional view. partly in elevation and on an enlarged scale.. of a portion of the Stoker illustrated in Fig. 1; and

' Fig. 3 is a transverse sectionalview, on an enlarged scale, taken on the line 33- of 'llghe Stoker illustrated in the drawings is of the multiple retort t pe and 1s provided with a plurality of re ativel'y long downwardly and rearwardly inchned retorts. 2 arranged side by side and spaced apart, with tuyre structures 4 spanning the space between the margins of the side walls of adjacent retorts: Each of the retorts 2` is provided with side walls 6 and a bottom wall 8.

A wind box 10 is arranged beneath the several retorts and tuyre structures to which air is supplied through a conduit 12' that is controlled by a damper 14. Each of the retorts is supplied with fuel from a hopper 16 by means of vthe usual horizontally reciprocating lunger 18 which is mounted to slide on the bottom wall 20 of the hopper.

ln'the illustrated construction. each retort is provided with an auxiliary rain or pusher which is made in two sections 22 that are mounted to slide longitudinallv on the bottom wall of the retort and are arranged one behind the other. Each pusher section 22 is provided with a base ate 24 in sliding engagement with the bottom Wall of the reder side of the retort is secured to the base plate 24 by means of bolts 27, the bolts extending through suitable bosses 28 on said plates which extend through an opening 30 in the bottom wall of the retort closed by the plate 26. A yoke 32 is secured to the underside of each plate 26 and is provided with a depending projection 34. A rod 36 extends through apertures in the projections 34 of the pusher sect-ions 22 of each retort. An abutment collar 38 is secured on the rod 36 at the forward side of the projection 34 of the forward pusher section 22, and similar abutment collars 40 are secured on the rod at opposite sides of the projection 34 of the rear pusher section. 22. A collar 42 is secured on the rod 36 at the rear of the forward projection 34 and is provided with a projecting portion 44 that is connected by a link 46 with a collar 48 secured on the rear end of a horizontal rod 50. The rod 50 is mounted to slide in suitable bearings 52 and is reciprocated by the main feeding plunger 18 through 'a lost motion connection comprising a yoke54 connected to move with said plunger and having a projection 56 that extends between abutment collars 58 se- 'cured on the rod 50. The yoke 54 is connected with the plunger 18 by means of a. transverse pin 53 secured to the plunger and having one end extended through a longitudinal clearance slot 55 in the plunger c inder or casing and through an upwar l extending ear 57 on the yoke. With this construction it will be apparent that upon o eration of the reciprocating feeding p iinger 18, the horizontal rod 50 will be reciprocated through its lost motion connection with the plunger and4 will act through the link 46 to impart a corresponding reciprocating movement to the rod 36 which in turn through its connections with the pusher sections 22, will impart a reciproeating movement to each of the sections longitudinally of the retort so as to feed the fuel down the retort.

The illustrated construction has provision for varying the extent of the feeding movements of the pusher sections 22 with relation to the main fuel feeding plunger 18, and also has provision for varying the feeding movements of the pusher sections 22 with relation to each other. Such provision llt tilt

for relative adjustment of the extent of the movements of the 'pusher sections 22 is advantageous for the reason that when burning lignites and coke breeze or similar low grade t'iiel, especially where air is admitted to the dumping grates or clinker grinders, a longer stroke is desirable for the lower pusher section 22 than for the upper section, while in certain other instances the reverse ot this is necessary to secure the best results. To provide for the adjustment ot' the extent of movements of the pusher sections 22 with relation to the main feeding plunger 18, the abutment collars 58 are adjustable longitudinally of the rod 50 so as to vary, as required, the degree of lost motion between the rod 50 and the plunger. To provide for adjustment oli' the extent ot movements of the pusher sections 22 with relation to each other, the abutment eollars 38 and 40 are adjustable longitudinally ot' the rod 36. lVhen the collars 38 and 40 are adjusted to the relative position shown in Fig. 1 of the drawings, a lost motion connection is provided between the lower pusher section 22 and the rod 36, while no lost motion is provided between the upper pusher section 22`and the rod, so that the movenient imparted to the rear pusher section 22 when the collars 88 and 40 are thus adjusted is less in extent than the movement :imparted to the forward pusher section. lt will be apparent that by proper adjustment of the abutment collars 38 and 40, the reverse of this may be eti'ected. lt will also be apparent that by adjusting the abutment collars 40 on the rod 3G, the lower pusher section 22 may be adjusted toward and from the upper pusher section; and that by adjusting the collars 38 and 42 on the rod 36 that the upper pusher section 22 may be adjusted toward and 'trom the lower pusher section.

l'n the illustrated construction the pusher sections 22 constitute active overleed grate sections and means is provided for varying the supply et air to the two sections independently o't each other. As shown, each pusher section 22 is provided with upper and lower pusher members 56 and 58, between which are mounted a series of tuy`ere blocks (l0 similar to one another and con .stituting intermediate pushing members. 'l`he lower member 58 is secured to the base plate 2l, by a holt (l2 and a projection 64 that enters a recess in the end tace ol the member 58. 'lhe lowermost intermediate member (SO rests partially upon the hase, plate 24 and partially upon the lower pusher member 58. it being provided with a rearwardly and downwardly extending tongue o6 which hooks beneath the upper edge oiE the member 58. 'lhe succeeding intermediate members are similarly related to the preceding intermediate members and are secured thereto in a similar manner. The upper pusher member 56 rests partially upon the uppern'iost intermediate member 60 and partially upon the base plate 2l and is cured to the base plate by a bolt 68, so that the upper and lower pusher members and the intermediate pusher members are all fixed in relation to one another and to the base plate. The bottom wall 8 ol5 the retort is provided with openings under the pusher sections 22, respectively, which can bo wholly or partially closed by .sliding dampers 72 resting on ledges 74 formed on dcpending flanges 76 on the longitudinal edges of the bottom wall, and secured in adjusted position by setscrews 78. The base plate 24 is provided with openings 8O through which air can pass to the under side of the pusher members 56, 58 and (St) trom the wind box 10 through the damper controlled openings 70. The pusher member 58 has in its forward end a series of bottom grooves forming air ports 82 through which part ot' this air from the wind box is discharged to the fuel in advance thereof; Each of the intern'iediate members (it) has on its bot- 4tom i'ace grooves 8l, through which the air `bers o6 and 58 an air chamber into which the ports 8O ot' the base plate open to admit air subject to the control oi the dampers 72. The construction of each pusher section as above described. is similar to that o'l' the auxiliary fuel feeding ram or pusher illustrated and described in my pending application Serial No. 686,528, tiled May 4e 1923.

As will be evident to those slrilled in the art my invention permitsl oli various modifications without departing from the spirit thereof or the scope of the appended claims.

What l claim is:

1. tn underteed stolzer having, in combination. a plurality oit downwardly and rearwardly inclined retorts and tuyere structures alternately arranged, a pusher mounted in one ot said retorts to slide in the general direction or the inclination ot the bottom wall thereotI and made in a plurality of sections arranged one behind the other, and means tor reciprocating said sections simultaneously in thc same direction longitudinally ot' the retort. and also 'lor reciprocating said sections with relation to each other. each ot said sections being made up ot a plurality ot 'l'uel supporting;n air supplying blocks arranged in overlapping relation to provide a plurality ot' Ylit-el pushing 'laces arranged in stepjied relation, and means tor supplying air to said bloclis.

An underteed stolter having, in coml. It tl ylU bination, a plurality of downwardly and rearwardly inclined retorts and tuyre structures alternately arranged, a plurality of fuel supporting air supplying structures mounted to slide upon the bottom wall of each retort in the general direction of the inclination thereof and arranged one behind the other, and independently controllable means for admitting air' topeach `of said structures.

3. An underfeed stoker having, in oombination, a plurality of downwardly and rearwardly inclined retorts and tuyre structures alternately arranged, ya plurality of fuel supporting air supplying structures mounted to slide upon the bottom wall of each retort in the general direction of the inclination thereof and arranged one behind the other, means for admitting air to 'each of said structures, and means forreoiproeating said structures longitudinally of the retort having provision for adjustment to vary the relative positions of the structures longitudinally of the retort.

4:'. An underfeed Stoker having, in combination, a retort, tuyre structures arranged at opposite sides of the retort, a plurality of fuel supporting air supplying structures mounted to slide longitudinally ,of the retort and arranged one behind the other at the bottom of the retort, and independently oontrollable means for admitting air to each of said structures.

5. An underfeed Stoker having, 4in combination, a retort, tuyre structures arranged at opposite sides of the retort, a plurality of fuel supporting air supplying structures arranged one behind the other at the bottom of the retort and mounted to slide longitudinally thereof, each of said structures comprising a base of hollow construction, and tuyre blocks in communication With the interior of said base and mounted on the `base in overlapping relation to provide a plurality of fuel pushing faces arranged in stepped relation, and means for .reciprocating said structures longitudinally of the retort, the movements of the tWo structures being of diderent extent.

EDWIN LUNDGREN. 

